The caterer we have in mind does not have a service charge or tip already built into the price, so I want an idea of how much I should plan to tip on the day of. I've read in various places different things and would like to know what is proper etiquette or what others here have done/plan to do. I've read that people commonly tip 15-20% of total bill, but that seems really excessive. We will be having a relatively small wedding (about 100 guests), but the catering bill still may go into about $10k range. I've also read that some people tip a flat amount, such as $100 per cook, $50 per server, etc, which would be a lot more affordable.
I would like to be respectful and show appreciation (hopefully, if deserved), but I also don't want to break the bank even more so than we already have. Any advice or thoughts would be appreciated!